Convert Number to Words in C# Language

In this tip/trick shows how to convert a number to words in C# language with second language(Persian, English).

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
namespace NumberToText
{
/// <summary>
/// Number to word languages
/// </summary>
public enum Language
{
/// <summary>
/// English Language
/// </summary>
English,
/// <summary>
/// Persian Language
/// </summary>
Persian
}
/// <summary>
/// Digit's groups
/// </summary>
public enum DigitGroup
{
/// <summary>
/// Ones group
/// </summary>
Ones,
/// <summary>
/// Teens group
/// </summary>
Teens,
/// <summary>
/// Tens group
/// </summary>
Tens,
/// <summary>
/// Hundreds group
/// </summary>
Hundreds,
/// <summary>
/// Thousands group
/// </summary>
Thousands
}
/// <summary>
/// Equivalent names of a group
/// </summary>
public class NumberWord
{
/// <summary>
/// Digit's group
/// </summary>
public DigitGroup Group { set; get; }
/// <summary>
/// Number to word language
/// </summary>
public Language Language { set; get; }
/// <summary>
/// Equivalent names
/// </summary>
public IList<string> Names { set; get; }
}
/// <summary>
/// Convert a number into words
/// </summary>
public static class ConvertNumberToText
{
#region Fields (4)
/// <summary>
///
/// </summary>
private static readonly IDictionary<Language, string> And = new Dictionary<Language, string> { { Language.English, " " }, { Language.Persian, " ? " } };
/// <summary>
///
/// </summary>
private static readonly IList<NumberWord> NumberWords = new List<NumberWord>
{
new NumberWord { Group= DigitGroup.Ones, Language = Language.English, Names = new List<string> { string.Empty, "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }},
new NumberWord { Group= DigitGroup.Ones, Language = Language.Persian, Names = new List<string> { string.Empty, "??", "??", "??", "????", "???", "??", "???", "???", "??" }},
new NumberWord { Group= DigitGroup.Teens, Language = Language.English, Names = new List<string> { "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }},
new NumberWord { Group= DigitGroup.Teens, Language = Language.Persian, Names = new List<string> { "??", "?????", "??????", "?????", "??????", "??????", "??????", "????", "????", "?????" }},
new NumberWord { Group= DigitGroup.Tens, Language = Language.English, Names = new List<string> { "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }},new NumberWord { Group= DigitGroup.Tens, Language= Language.Persian, Names=new List<string> { "????", "??", "???", "?????", "???", "?????", "?????", "???" }},
new NumberWord { Group= DigitGroup.Hundreds, Language = Language.English, Names = new List<string> {string.Empty, "One Hundred", "Two Hundred", "Three Hundred", "Four Hundred","Five Hundred", "Six Hundred", "Seven Hundred", "Eight Hundred", "Nine Hundred" }},new NumberWord { Group= DigitGroup.Hundreds, Language= Language.Persian, Names=new List<string> {string.Empty, "????", "?????", "????", "??????", "?????", "????", "?????", "?????" , "????" }},
new NumberWord { Group= DigitGroup.Thousands, Language= Language.English, Names = new List<string> { string.Empty, " Thousand", " Million", " Billion"," Trillion", " Quadrillion", " Quintillion", " Sextillian"," Septillion", " Octillion", " Nonillion", " Decillion", " Undecillion", " Duodecillion", " Tredecillion"," Quattuordecillion", " Quindecillion", " Sexdecillion", " Septendecillion", " Octodecillion", " Novemdecillion"," Vigintillion", " Unvigintillion", " Duovigintillion", " 10^72", " 10^75", " 10^78", " 10^81", " 10^84", " 10^87"," Vigintinonillion", " 10^93", " 10^96", " Duotrigintillion", " Trestrigintillion" }},
new NumberWord { Group= DigitGroup.Thousands, Language= Language.Persian, Names = new List<string> { string.Empty, " ????", " ??????", " ???????"," ???????", " Quadrillion", " Quintillion", " Sextillian"," Septillion", " Octillion", " Nonillion", " Decillion", " Undecillion", " Duodecillion", " Tredecillion"," Quattuordecillion", " Quindecillion", " Sexdecillion", " Septendecillion", " Octodecillion", " Novemdecillion"," Vigintillion", " Unvigintillion", " Duovigintillion", " 10^72", " 10^75", " 10^78", " 10^81", " 10^84", " 10^87"," Vigintinonillion", " 10^93", " 10^96", " Duotrigintillion", " Trestrigintillion" }},
};
/// <summary>
///
/// </summary>
private static readonly IDictionary<Language, string> Negative = new Dictionary<Language, string> { { Language.English, "Negative " }, { Language.Persian, "????? " } };
/// <summary>
///
/// </summary>
private static readonly IDictionary<Language, string> Zero = new Dictionary<Language, string> { { Language.English, "Zero" }, { Language.Persian, "???" } };
#endregion Fields
#region Methods (7)
// Public Methods (5)
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this int number, Language language)
{
return NumberToText((long)number, language);
}
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this uint number, Language language)
{
return NumberToText((long)number, language);
}
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this byte number, Language language)
{
return NumberToText((long)number, language);
}
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this decimal number, Language language)
{
return NumberToText((long)number, language);
}
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this double number, Language language)
{
return NumberToText((long)number, language);
}
/// <summary>
/// display a numeric value using the equivalent text
/// </summary>
/// <param name="number">input number</param>
/// <param name="language">local language</param>
/// <returns>the equivalent text</returns>
public static string NumberToText(this long number, Language language)
{
//
if (number == 0) { return Zero[language]; }
//
if (number < 0) { return Negative[language] + NumberToText(-number, language); }
//
return Wordify(number, language, string.Empty, 0);
}
/// <summary>
///
/// </summary>
/// <param name="value">input string number</param>
/// <param name="language">local language</param>
/// <returns></returns>
public static string NumberToText(this string value, Language language)
{
int number;
if (int.TryParse(value, out number)) return NumberToText(double.Parse(value), language);
throw new FormatException("Input string is not correct format.");
}
// Private Methods (2)
/// <summary>
///
/// </summary>
/// <param name="idx"></param>
/// <param name="language"></param>
/// <param name="group"></param>
/// <returns></returns>
private static string GetName(int idx, Language language, DigitGroup group)
{
return NumberWords.First(x => x.Group == group && x.Language == language).Names[idx];
}
/// <summary>
///
/// </summary>
/// <param name="number"></param>
/// <param name="language"></param>
/// <param name="leftDigitsText"></param>
/// <param name="thousands"></param>
/// <returns></returns>
private static string Wordify(long number, Language language, string leftDigitsText, int thousands)
{
//
if (number == 0) return leftDigitsText;
//
var wordValue = leftDigitsText;
//
if (wordValue.Length > 0) wordValue += And[language];
//
if (number < 10) wordValue += GetName((int)number, language, DigitGroup.Ones);
//
else if (number < 20) wordValue += GetName((int)(number - 10), language, DigitGroup.Teens);
//
else if (number < 100) wordValue += Wordify(number % 10, language, GetName((int)(number / 10 - 2), language, DigitGroup.Tens), 0);
//
else if (number < 1000) wordValue += Wordify(number % 100, language, GetName((int)(number / 100), language, DigitGroup.Hundreds), 0);
//
else wordValue += Wordify(number % 1000, language, Wordify(number / 1000, language, string.Empty, thousands + 1), 0);
//
if (number % 1000 == 0) return wordValue;
//
return wordValue + GetName(thousands, language, DigitGroup.Thousands);
}
#endregion Methods
}
}

Example:

using System;
namespace NumberToText
{
static class Program
{
static void Main()
{
Console.WriteLine("1223".NumberToText(Language.English));
var num = 10;
Console.WriteLine(num.NumberToText(Language.English));
}
}
}

For download sample project click the following link

https://github.com/omidnasri/NumberToText